mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-27 07:01:24 +00:00
1626308797
Recieve/Receive recieve/receive Interupt/Interrupt interupt/interrupt Addres/Address addres/address Signed-off-by: Mike Williams <mike@mikebwilliams.com>
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/*
|
|
* NS16550 Serial Port
|
|
* originally from linux source (arch/powerpc/boot/ns16550.h)
|
|
* modified slightly to
|
|
* have addresses as offsets from CONFIG_SYS_ISA_BASE
|
|
* added a few more definitions
|
|
* added prototypes for ns16550.c
|
|
* reduced no of com ports to 2
|
|
* modifications (c) Rob Taylor, Flying Pig Systems. 2000.
|
|
* further modified to support the 8245 duart
|
|
* modifications (c) Paul Jimenez, Musenki, Inc. 2001.
|
|
*/
|
|
|
|
|
|
struct NS16550 {
|
|
unsigned char rbrthrdlb; /* 0 */
|
|
unsigned char ierdmb; /* 1 */
|
|
unsigned char iirfcrafr; /* 2 */
|
|
unsigned char lcr; /* 3 */
|
|
unsigned char mcr; /* 4 */
|
|
unsigned char lsr; /* 5 */
|
|
unsigned char msr; /* 6 */
|
|
unsigned char scr; /* 7 */
|
|
unsigned char reserved[2]; /* 8 & 9 */
|
|
unsigned char dsr; /* 10 */
|
|
unsigned char dcr; /* 11 */
|
|
};
|
|
|
|
|
|
#define rbr rbrthrdlb
|
|
#define thr rbrthrdlb
|
|
#define dll rbrthrdlb
|
|
#define ier ierdmb
|
|
#define dlm ierdmb
|
|
#define iir iirfcrafr
|
|
#define fcr iirfcrafr
|
|
#define afr iirfcrafr
|
|
|
|
#define FCR_FIFO_EN 0x01 /*fifo enable */
|
|
#define FCR_RXSR 0x02 /*receiver soft reset */
|
|
#define FCR_TXSR 0x04 /*transmitter soft reset */
|
|
#define FCR_DMS 0x08 /* DMA Mode Select */
|
|
|
|
#define MCR_RTS 0x02 /* Readyu to Send */
|
|
#define MCR_LOOP 0x10 /* Local loopback mode enable */
|
|
/* #define MCR_DTR 0x01 noton 8245 duart */
|
|
/* #define MCR_DMA_EN 0x04 noton 8245 duart */
|
|
/* #define MCR_TX_DFR 0x08 noton 8245 duart */
|
|
|
|
#define LCR_WLS_MSK 0x03 /* character length slect mask */
|
|
#define LCR_WLS_5 0x00 /* 5 bit character length */
|
|
#define LCR_WLS_6 0x01 /* 6 bit character length */
|
|
#define LCR_WLS_7 0x02 /* 7 bit character length */
|
|
#define LCR_WLS_8 0x03 /* 8 bit character length */
|
|
#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
|
|
#define LCR_PEN 0x08 /* Parity eneble */
|
|
#define LCR_EPS 0x10 /* Even Parity Select */
|
|
#define LCR_STKP 0x20 /* Stick Parity */
|
|
#define LCR_SBRK 0x40 /* Set Break */
|
|
#define LCR_BKSE 0x80 /* Bank select enable - aka DLAB on 8245 */
|
|
|
|
#define LSR_DR 0x01 /* Data ready */
|
|
#define LSR_OE 0x02 /* Overrun */
|
|
#define LSR_PE 0x04 /* Parity error */
|
|
#define LSR_FE 0x08 /* Framing error */
|
|
#define LSR_BI 0x10 /* Break */
|
|
#define LSR_THRE 0x20 /* Xmit holding register empty */
|
|
#define LSR_TEMT 0x40 /* Xmitter empty */
|
|
#define LSR_ERR 0x80 /* Error */
|
|
|
|
/* useful defaults for LCR*/
|
|
#define LCR_8N1 0x03
|
|
|
|
|
|
volatile struct NS16550 *NS16550_init (int chan, int baud_divisor);
|
|
void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c);
|
|
unsigned char NS16550_getc (volatile struct NS16550 *com_port);
|
|
int NS16550_tstc (volatile struct NS16550 *com_port);
|
|
void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor);
|